Phonograph-needle.



F. L. WOOD.

PHONOGRAPH NEEDLE.

APPLICATION FILED JUNE 30.1915.

1 ,246,694. Patented Nov. 13, 1917.

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AIOLIAI PHON'OGBAPH-NEEDLE.

Speaication of Letters Patent.

application nieuwe so, 1915. serial no. sacas.

To all whom z't may concern:

Be it known that I, FREDERICK L. WOOD, a citizen of the United States,residing at Meriden, in the count of New Haven and State of Connecticut,ave invented certain new and useful Improvements in Phonograph-Needles,of which the following is a specification.

My present invention relates to a novel phonograph needle for use inreproducing sound from sound-records. The advantages i of my said needlewill be apparent to those skilled in the art from an understanding of.also a length of brass or steel tubing about eighty thousandths of aninch in diameter. The tubing may be shorter than the wire because itwill extend'farther than the wire in the hereinafter described drawingoperation. A The Xliole through the tubing is small so that it nicelyreceives the wire -into it. The wire having been inserted entirelythrough the tubing, the two are brought into union with each other bybeing subjected to a wire-drawing operation. In Fig. 1, the wire isdesignated 1 and is shown located inside the tubing 2 preparatory forthe drawing operation. In Fig. 2, 3 is the wire-drawing die. The sheathand wire to the right 'of the die are supposed to have been drawnthrough it. They are reduced in diameter,

elongated and drawn into perfect union with each other. The wire thusbecomes perfectly integrated with the sheath to the great benefit of thetonal qualities ofthe resulting needle. The piano wire is hard to startwith; and the metaltubing becomes so, due to the drawing operation, withthe result that itis given a finely resonant and other qualities,especially adapting the composite wire for phonograph needles. To thisend,

annealing is avoided in connection with the drawing operation oroperations. The brass sheath gives a softer playing needle than thesteel.

yThe next step yin the manufacture of the y .This is shown in Fig. 3where 'the point isv designated 4. Both sheath and wire will then be cutthrough on the line 5-5 in Fig. 3 to produce the nal needle. `The resultof this step is shown in Fig. 4. The same milling and cutting offoperations will then be repeated on the remaining free-end portion AFig/1 and so on until the whole length of the composite sheathing andwire is formed into needles.

The tonal quality of these needles is excellent; and their hard drawnpiano-wire points are tough, non-breaking, very smooth and uniform inaction, and capable of playing a great many records per needle.

Of course, it is possible that certain steps could be practised iii-thereverse order and other changes might be made in the process or thematerials which would still be within the spirit and intent of myinvention and these I mean to be covered by the claims.

I prefer tol choose my material for vthe sheath so that after the finaldrawing operation it will still be suiiciently softer than thepiano-wire that a milling tool can be chosen which will cut the sheathto expose the wire-point without cutting the oint, this selectie actionof the tool making it easy and practical to expose said points.

What I claim is 1. A. phonograph needle comprising a ssl metal sheathfilled with a wire, the two having a drawn union with each other, oneend` of the wire being exposed for a short distance toform the recordengaging point.

2. A phonograph needle comprising a metal sheath filled with a wire, thetwo having a drawn union with each other, said nedle having a recordengaging point at its en In testimony whereof, I have signed my ioo nameto" this specification thisv 29th day of June 1915.

FREDERICK L. WOOD.

